Knee cushion



FIG. 1 is a perspective view of a knee cushion showing our new design;

FIG. 2 is a side view thereof;

FIG. 3 is an end view thereof, the opposite end view being identical thereto;

FIG. 4 is an opposite side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines on the knee cushion represent conventional stitching. 

The ornamental design for a knee cushion, as shown and described. 